Fix build issue on windows

[fabinsch]

we encountered in the proxsuite-feedstock, here

D:\bld\proxsuite_1732720555127\work\include\proxsuite/linalg/veg/tuple.hpp(757,26): error: a template argument list is expected after a name prefixed by the template keyword [-Wmissing-template-arg-list-after-template-kw]
  757 |     return cat::template from_ref_to_result(
      |                          ^
1 warning and 1 error generated.
NMAKE : fatal error U1077: 'D:\bld\proxsuite_1732720555127\_build_env\Library\bin\cmake.exe' : return code '0x1'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\nmake.exe"' : return code '0x2'
Stop.
Traceback (most recent call last):
  File "C:\Miniforge\lib\site-packages\conda_build\build.py", line 2510, in build
    windows.build(
  File "C:\Miniforge\lib\site-packages\conda_build\windows.py", line 339, in build
    check_call_env(
  File "C:\Miniforge\lib\site-packages\conda_build\utils.py", line 406, in check_call_env
    return _func_defaulting_env_to_os_environ("call", *popenargs, **kwargs)
  File "C:\Miniforge\lib\site-packages\conda_build\utils.py", line 382, in _func_defaulting_env_to_os_environ
    raise subprocess.CalledProcessError(proc.returncode, _args)
subprocess.CalledProcessError: Command '['cmd.exe', '/d', '/c', 'conda_build.bat']' returned non-zero exit status 1

The patch recipe/fix-windows.patch is related to content in this PR.

[jorisv]

On last MSVC release, header include header when C++20 is activated.
Format declare a structured binding, that seem to conflict with openmp use in last llvm release.

Related to:

• Cannot capture structured bindings in lambda llvm/llvm-project#96275
• [OpenMP][Clang] Support capturing structured binding in OpenMP llvm/llvm-project#66999
• clang: OpenMP conflict with #include <format>  llvm/llvm-project#105498
• [OpenMP] C++ OpenMP parser crash with structured bindings llvm/llvm-project#62404

[jorisv]

The bug is fixed in clang 19. So I installed clang from conda-forge and I changed the workflow to use this version.